Which statement is true about the cells in multicell organisms?

they can all turn into the same kind of cell if needed.

they are all identical.

they usually have certain special functions.

they are prokaryotic cells.

They usually have certain special functions.

Explanation:

Think of the functions of different types of human cells.  Red blood cells to transport oxygen, nerve cells to send messages, etc.

cell regulation is conducted by special proteins.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.